Voltammetric determination of aluminum(III) using a reagentless sensor fabricated by sol–gel process

2004 ◽  
Vol 99 (2-3) ◽  
pp. 468-473 ◽  
Author(s):  
Junwei Di ◽  
Shuping Bi ◽  
Tianyu Yang ◽  
Ming Zhang
Keyword(s):  
Sol Gel ◽  
Voltammetric Determination ◽  
Sol Gel Process

EFFECT OF ANNEALING TEMPERATURE ON THE OPTICAL AND STRUCTURAL PROPERTIES OF DIP-COATED Al2O3 THIN FILMS PREPARED BY SOL–GEL ROUTE

2005 ◽  
Vol 12 (05n06) ◽  
pp. 793-797 ◽  
Author(s):  
F. E. GHODSI ◽  
M. MAFAKHERI ◽  
A. NOVINROOZ
Keyword(s):  
Thin Films ◽  
Structural Properties ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Sol Gel Process ◽  
Dip Coating Technique

Thin films of Al 2 O 3 were prepared by the sol–gel process. Dip-coating technique was used for deposition of the Al 2 O 3 thin films onto glass substrates. Optical and structural properties of the films were investigated with respect to the annealing temperature (100–500°C). The structure of these films was determined by X-ray diffraction (XRD). Scanning electron microscopy (SEM) was performed for the analysis of surface morphology. For determination of the optical constants of Al 2 O 3 thin films, UV-Visible spectrophotometry measurements were carried out. Annealing temperature affects the structural and optical properties of the Al 2 O 3 thin films. The refractive index and extinction coefficient of the films at 550 nm wavelength increase from 1.56 to 1.66, and from 3.41 × 10-5 to 5.54 × 10-5, respectively while optical band gap and thickness of the films decrease from 4.15 eV to 4.11 eV, and 360 nm to 260 nm, respectively, by increasing annealing temperature from 100°C to 500°C.

scholarly journals Multinuclear Magnetic Resonance Study on Aluminium Sec-butoxide Chelated with Ethyl Acetoacetate in Various Amounts

2019 ◽  
Vol 92 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Stanislav Kurajica ◽  
Gregor Mali ◽  
Vilko Mandić ◽  
Iva Minga
Keyword(s):  
Ethyl Acetoacetate ◽  
Sol Gel ◽  
Gain Control ◽  
Spectroscopic Techniques ◽  
27Al Nmr ◽  
One Dimensional ◽  
Sol Gel Process ◽  
Rapid Hydrolysis ◽  
First Time

Reactive aluminum alkoxide (ASB, aluminium sec-butoxide) was chelated using β-diketone (EAA, ethyl acetoacetate) in order to gain control over rapid hydrolysis in the course of the sol-gel process. Derived chelates were analysed using several NMR spectroscopic techniques: one-dimensional 1H, 13C, 27Al NMR and two-dimensional COSY, HSQC and DOSY. The NMR analysis enabled identification of the formed chelate species, as well as determination of their quantitative relationships. Several complexation products were observed: tris-chelated monomer, Al(EAA)3, bis-chelated dimmer, Al2(OnBu)4(EAA) 2, tris-chelated dimmer, Al2(OnBu)3(EAA)3, tetra-chelated dimmer, Al2(OnBu)2(EAA)4, and monochelated trimer, Al3(OnBu)8(EAA). Of the formed oligomer compounds, this is the first evidence of Al2(OR)3L3 in any alkoxide and β-ketoester or β-diketone combination. Aluminium sec-butoxide and ethyl acetoacetate complexes Al2(OnBu)4(EAA) 2 and Al2(OnBu)2(EAA)4 were also observed for the first time. With the increase of the EAA/ASB ratio the coordination of aluminium shifts towards six, whereas above the EAA/ASB ratio of 2.5 solely six-coordinated aluminium exists.

The Detection of Hexavalent Chromium by Organically Doped Sol-Gels

1994 ◽  
Vol 346 ◽  
Author(s):  
Phillip W. Wong ◽  
John D. Mackenzie
Keyword(s):  
Hexavalent Chromium ◽  
Malachite Green ◽  
Spectrophotometric Determination ◽  
Quantitative Method ◽  
Organic Molecules ◽  
Sol Gel ◽  
Metallic Ions ◽  
Sol Gel Process ◽  
Trace Concentrations

ABSTRACTThe sol-gel process can be used to produce porous inorganic matrices that are doped with organic molecules. These doped gels can be used as a quantitative method for the spectrophotometric determination of trace concentrations of metallic ions. For the detection of hexavalent chromium, malachite green was used as the dopant. Preliminary results indicate concentrations on the order of 5 ppb are detectable using this method.

Determination of Ultra-Trace of Herbicides Using Smart Nanoparticles

2013 ◽  
Vol 699 ◽  
pp. 144-149 ◽  
Author(s):  
Nezar H. Khdary
Keyword(s):  
Sol Gel ◽  
Spherical Particles ◽  
Sol Gel Process ◽  
Ultra Trace ◽  
Solvent Modification

18- Smart Nanoparticles was synthesized using sol-gel process. The spherical particles were obtained using appropriate parameters such as solvent. Modification of C18-Smart Nanoparticles was carried out using trichloro and trimethoxy octadecylsilane. The modified particles were designed for extraction and preconcentration of herbicides as illustrated in figure 1. Herbicides molecules were easily recognized by C18- Smart Nanoparticles and the recoveries were varied from 59-82%.

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